And just to be clear, there's no such thing as a situation where there's no disagreement.

For me there's two important pieces. First, make sure that the things that are likely to be disagreed about aren't the things that are inherently toxic (like whose smarter about how things really work).

And second, make sure your game answers the question...now that we have a disagreement on our hands (inevitable if you play long enough)what do we do about it. And I'll note, for my money, I find "just work it out" to be pretty weak...more of a cop out than an answer.